A white guy that thinks he knows Jamaica better than the people that live in Jamaica. Even though he has only been to the tourist trap towns, he pretends like it is his home away from home! He might name his fantasy football team "Mr. Jamaica", so people think that he is an "expert" on Jamaican culture even though he is not. He stocks his fridge with Red Stripe. Ganja makes him paranoid!

Mikey is a total Mr. Jamaica.

or....

There is some guy in my fantasy football league named Mr. Jamaica, what is his deal?
or....
Hey Mr. Jamaica! Pass me a Red Stripe, Mon!
or...
I saw Mr. Jamaica at the dancehall last night, he was conquering duppies!